diff --git a/cmd/cert.go b/cmd/cert.go
index 162284f2d..a627334e7 100644
--- a/cmd/cert.go
+++ b/cmd/cert.go
@@ -22,7 +22,7 @@ import (
 type Flag struct {
 	AltNames     []string
 	NodeName     string
-	ServiceCIRD  string
+	ServiceCIDR  string
 	NodeIP       string
 	DNSDomain    string
 	CertPath     string
@@ -37,7 +37,7 @@ var certCmd = &cobra.Command{
 	Short: "generate certs",
 	Long:  `you can specify expire time`,
 	Run: func(cmd *cobra.Command, args []string) {
-		cert.GenerateCert(config.CertPath, config.CertEtcdPath, config.AltNames, config.NodeIP, config.NodeName, config.ServiceCIRD, config.DNSDomain)
+		cert.GenerateCert(config.CertPath, config.CertEtcdPath, config.AltNames, config.NodeIP, config.NodeName, config.ServiceCIDR, config.DNSDomain)
 	},
 }
 
@@ -47,7 +47,7 @@ func init() {
 
 	certCmd.Flags().StringSliceVar(&config.AltNames, "alt-names", []string{}, "like sealyun.com or 10.103.97.2")
 	certCmd.Flags().StringVar(&config.NodeName, "node-name", "", "like master0")
-	certCmd.Flags().StringVar(&config.ServiceCIRD, "service-cird", "", "like 10.103.97.2/24")
+	certCmd.Flags().StringVar(&config.ServiceCIDR, "service-cidr", "", "like 10.103.97.2/24")
 	certCmd.Flags().StringVar(&config.NodeIP, "node-ip", "", "like 10.103.97.2")
 	certCmd.Flags().StringVar(&config.DNSDomain, "dns-domain", "cluster.local", "cluster dns domian")
 	certCmd.Flags().StringVar(&config.CertPath, "cert-path", "/etc/kubernetes/pki", "kubernetes cert file path")